Arrange the chemical elements in order of increasing non-metallic properties S, CL, P, AL

Let us arrange the following chemical elements in order of increasing non-metallic properties S, CL, P, AL. We get the following.

All these chemical elements are in the same period. Period is a line of the periodic table of chemical elements, a sequence of atoms according to the increase in the nuclear charge and the filling of the outer electron shell with electrons. The metallic properties decrease from left to right over the period, therefore, the non-metallic properties increase from left to right.

So, we have it as follows: AL, P, S, CL.